Top Definition
An stronger form of beat it up. While beating it up means having intercourse with a woman, beating it uuuuup means really going at it like crazy or doing it multiple times. The more you drag out the "u" in "up," the more vigorous and/or repeated you are trying to say that the act was. Further emphasis can be added by sticking your tongue out during the "uuuuu" part.
Situation: Steve's little sister, Tammy, is a high school senior considering attending a college 500 miles from where Steve's family lives. Steve's friend from high school, Josh, is currently a junior at that college. Steve thought it would be a good idea for Josh to show Tammy around and introduce her to some people during her visit to the school.

Steve: "How did everything go with Tammy? It sounds like she had a great time."
Josh: "She sure as hell did! First I showed her around campus and introduced her to some of my friends. Then we went out to a bar and had a bunch of shots. After that I took it back to my place and I beat it up. Sorry dude."
Steve: "How could you, man? That's really disrespectful. Oh well, I'll get over it. We still on for South Padre for spring break?"
Josh: "Fo' shizzle my nizzle."

Alternatively:
Steve: "How did everything go with Tammy? It sounds like she had a great time."
Josh: "She sure as hell did! First I showed her around campus and introduced her to some of my friends. Then we went out to a bar and had a bunch of shots. After that I took it back to my place and I beat it uuuuup! Skeet skeet! Sorry dude."
Steve: "WHAAAAT!?!?!? You motherfucking son of a bitch! That's my little sister! I'm going to kill you!!!"
by Nicholas D March 10, 2010

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